

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */

using System;
using Velocity4Net.Util.Introspection;
using Velocity4Net.Errors;
using Velocity4Net.Runtime.Logging;
namespace Velocity4Net.Runtime.Parse.AST
{

    /**
     * Executor that simply tries to execute a put(key, value)
     * operation. This will try to find a put(key) method
     * for any type of object, not just objects that
     * implement the Map interface as was previously
     * the case.
     *
     * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
     * @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
     * @version $Id: PutExecutor.java 687177 2008-08-19 22:00:32Z nbubna $
     * @since 1.5
     */
    public class PutExecutor : SetExecutor
    {
        private Introspector introspector;
        private String property;

        /**
         * @param log
         * @param introspector
         * @param clazz
         * @param arg
         * @param property
         */
        public PutExecutor(Log log, Introspector introspector,
                Type clazz, Object arg, String property)
        {
            this.log = log;
            this.introspector = introspector;
            this.property = property;

            discover(clazz, arg);
        }

        /**
         * @param clazz
         * @param arg
         */
        protected void discover(Type clazz, Object arg)
        {
            Object[] _params;

            // If you passed in null as property, we don't use the value
            // for parameter lookup. Instead we just look for put(Object) without
            // any parameters.
            //
            // In any other case, the following condition will set up an array
            // for looking up put(String, Object) on the class.

            if (property == null)
            {
                // The passed in arg object is used by the Cache to look up the method.
                _params = new Object[] { arg };
            }
            else
            {
                _params = new Object[] { property, arg };
            }

            try
            {
                Method=(introspector.getMethod(clazz, "Add", _params));
            }
            /**
             * pass through application level runtime exceptions
             */
            catch (ApplicationException e)
            {
                throw e;
            }
            catch (System.Exception e)
            {
                String msg = "Exception while looking for put('" + _params[0] + "') method";
                log.error(msg, e);
                throw new VelocityException(msg, e);
            }
        }

        /**
         * @see org.apache.velocity.runtime.parser.node.SetExecutor#execute(java.lang.Object, java.lang.Object)
         */
        public override Object Execute(Object o, Object value)
        {
            Object[] _params;

            if (isAlive())
            {
                // If property != null, pass in the name for put(key, value). Else just put(value).
                if (property == null)
                {
                    _params = new Object[] { value };
                }
                else
                {
                    _params = new Object[] { property, value };
                }

                return Method.Invoke(o, _params);
            }

            return null;
        }
    }
}